No not spoken to the surgeon - i assume he will say i should be able to. How much stretching did it take? Was it your hip flexors stopping you?
I was very flexible before, I have 30+ years in martial arts, so I may have started at a more advanced point.
By two years, I could sit cross legged and had started doing yoga. As with everything else, moderation is the key, especially when we've been both "upgraded" with a prosthetic hip and we also have muscular issues (atrophied muscles, overdeveloped compensating muscles) to work out.
Crossing my hips was not a goal, but other things were. As with all goals, it takes time to get there. If you have tendinitis on one side and impingement, you have to take those into consideration when doing stuff that may involve those areas, like crossing the legs.
Now when you say crossing your legs, you don't mean lotus position, but something similar or is it just putting one leg on top of the other while sitting?